Applying to College

I will be applying to British universities this year but I also wanted to explore the possibilities of American Politics.
Over the past 3 years, I have received mainly A* and A with 1/2 Bs
For my predicted Alevel grades I have AAA in Politics, English, Spanish
I am a writer for an American magazine and have relevant writing experience
I am also a British delegate for the European Youth Parliament.
Languages spoken: English/Spanish/Arabic and learning Italian
Which universities would you recommend I apply to and would I stand a chance at Cornell/Chicago/Dartmouth?
Any advice would be much appreciated!

The universities you named are all selective enough that everyone should consider them long-shot applications. If you need financial aid to attend, your odds of getting in (with sufficient financial aid to attend) are even lower.